CN107579514A - A kind of wind-light storage direct current power system and control method for offshore platform - Google Patents
A kind of wind-light storage direct current power system and control method for offshore platform Download PDFInfo
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- CN107579514A CN107579514A CN201710935151.XA CN201710935151A CN107579514A CN 107579514 A CN107579514 A CN 107579514A CN 201710935151 A CN201710935151 A CN 201710935151A CN 107579514 A CN107579514 A CN 107579514A
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Abstract
The present invention relates to a kind of wind-light storage direct current power system and control method for offshore platform, the system includes：Platform power and platform loads.Platform power includes：Wind power generation unit, photovoltaic generation unit and energy-storage units.The control method is coordinated to control using principal and subordinate with reciprocity mixed-control mode, i.e., using energy-storage units as main power source, the bidirectional power converter in its energy storage subelement is using the sagging reciprocity control mode of power, to stablize line voltage；Wind-power electricity generation and photovoltaic generation unit are respectively slave voltage.Proposed by the invention makees a kind of wind-light storage direct current power system and control method for offshore platform, there is provided the independent complementary power supply system that a kind of a variety of new energy of offshore platform are formed, stable operation of the scene at random with load system when random can be achieved.
Description
Technical field
It is particularly a kind of for offshore platform the present invention relates to Naval Architecture and Ocean Engineering field and new energy application field
Wind-light storage direct current power system and control method.
Background technology
With the development of China's marine economy and the "Oceanic" strategy, oceanographic observation instrument, marine surveys, extra large work drilling well etc. are various
Offshore platform has turned into the important channel develop and useedd marine resources, obtain marine information.Offshore platform power-supplying forms at present
Mainly there is diesel-driven generator power supply, high voltage power transmission, high voltage power transmission to combine power supply etc. with offshore wind farm, but for off-lying sea platform and
Speech, in face of construction cost and the immense pressure of O＆M cost, people need to seek other autonomous power supply systems with high reliability.
Develop with the maturation of marinescape generation technology, be that independently-powered become of offshore platform load can using ocean scene resource
Energy.Influenceed by factors such as the limitation of platform area, marinescape intermittent nature and platform loads mutation so that platform wind light generation system
Unite as the independent microgrid system that capacity is small, wind light generation highlights with load electricity consumption stochastic behaviour.
When wind light generation technology is applied into offshore platform, the mains side randomness and extra large work that honourable intermittence is brought are each
The randomness of power load, constitutes the serious bilateral stochastic behaviour of offshore platform power system needed for kind job platform, now,
The stability of the wind-light storage micro-grid system of finite capacity is just primarily faced as its normal operation and key urgently to be resolved hurrily is asked
Topic, simultaneously as without the support of big inertia diesel-driven generator or power network to busbar voltage, wind, light, storage and offshore platform are various
The load of different power reguirements is required to be connected on bus by electronic power converter interface circuit, and the small of its own is used to
Property feature determine that the interference of system external portion is extremely sensitive, therefore need to establish a kind of micro-capacitance sensor electric power system, including power system
Structure and corresponding coordination control strategy.Compared with AC electric power systems, direct current power system due to it is simple in construction, without it is idle with
Phase problem so that system reliability is higher, is more suitable for that offshore platform is this to require that power density is high, the flexible application of extension
Occasion.
Therefore, seek it is a kind of be applied to the limited capacity offshore platform wind-light storage direct current power system without diesel-driven generator,
The engineer applied of the multiple-energy-source independence complementary power supply system formed to offshore novel energy is significant.
The content of the invention
It is an object of the invention to provide a kind of wind-light storage direct current power system and control method for offshore platform, with
Overcome defect present in prior art.
To achieve the above object, the technical scheme is that：A kind of wind-light storage direct current power system for offshore platform
System, including：Platform power and the platform loads matched through dc bus with the platform power；The platform power includes：
Wind power generation unit, photovoltaic generation unit and energy-storage units；The wind power generation unit includes：Impeller, gear-box, permanent magnetism are same
Step generator and input are connected with the magneto alternator and output end accesses the rectifier of the dc bus；Institute
Stating photovoltaic generation unit includes：Photovoltaic cell and input are connected with the photovoltaic cell and output end accesses the direct current mother
First DC converter of line；The energy-storage units include some groups of structure identical energy storage subelements, every group of energy storage subelement
Include a lithium battery and input is connected with lithium battery and the second DC converter of the output end access dc bus.
In an embodiment of the present invention, the platform loads include：It is directly accessed the DC load of the dc bus, leads to
The DC load for crossing the DC converter access dc bus and the exchange that the dc bus is accessed by inverter are born
One or more of carry.
In an embodiment of the present invention, the rectifier is unidirectional power stream hf rectifier；First DC converting
Device is unidirectional power stream DC converter；Second DC converter is bidirectional power flow high frequency dc to dc converter.
Further, a kind of control method of the wind-light storage direct current power system for offshore platform is also provided, by described in
Energy-storage units are as main power source, and the second DC converter in energy storage subelement is using the sagging equity control of power, and by institute
Wind power generation unit is stated with real-time photovoltaic generation unit respectively as slave voltage, using mixing master ＆ slave control and equity control
Mode carries out coordination control.In an embodiment of the present invention, comprise the following steps：
Step S1：The impeller, the gear-box, the magneto alternator and the rectifier are connected；Institute
State impeller and convert wind energy into machine torque, machine torque is converted into electromagnetic torque by the magneto alternator, described whole
Stream device is converted to the control of the permanent-magnet synchronous hair output current control of rotating speed, to the maximum capture or defeated with invariable power of wind energy
Go out, and the dc bus is accessed in the form of current source；
Step S2：The photovoltaic cell is connected with first DC converter；The photovoltaic cell passes through solar energy
Generate electricity, and exported with direct current form；First DC converter adjusts according to the peak power curve of the photovoltaic cell
Input voltage, and photovoltaic peak power or constant power output are provided, and the dc bus is accessed in the form of current source；
Step S3：Energy storage subelement, and energy storage are formed after the lithium battery is connected with second DC converter
The output end through the second DC converter is in parallel respectively for unit, and the dc bus is accessed in the form of voltage source；
Step S4：The platform loads are accessed into the dc bus；
Step S5：Energy storage subelement relation equity in the energy-storage units, and second DC converter is by adopting
With the droop control of voltage-power based on current inner loop, voltage middle ring and power outer shroud, the equity of composition energy storage subelement
Control, to stablize the voltage of the dc bus, the direction for controlling power flow and numerical value；
Step S6：Using the energy-storage units as main power source, with regulated output voltage, by the wind power generation unit and institute
Photovoltaic generation unit is stated respectively as slave voltage, is accessed in the form of current source in dc bus, forms master ＆ slave control.
In an embodiment of the present invention, the rectifier in the wind power generation unit is by obtaining the gear-box
Rotational speed omega and the electric current i of magneto alternator output, by using maximal wind-energy capture control method, output current
iwd；
First DC converter in the photovoltaic generation unit obtains the electric current I of the photovoltaic cell outputPV, electricity
Press VPVAnd photovoltaic cell ambient lighting temperature, by using maximum power tracking and controlling method, output current iPV；Through power
After calculating and LPF, the power output P of photovoltaic generation unit is obtainedpv；
Also include a power manager, pass through output current iwd, after power calculation and LPF, obtain wind-force hair
The power output P of electric unitwd；Pass through output current iPV, after power calculation and LPF, obtain photovoltaic generation unit
Power output Ppv；Pass through the input current i of the platform loadsL, after power calculation and LPF, obtain platform and bear
The input power P of loadL；
The power P then provided needed for the energy-storage unitsbFor：
Pb=PL-Pwd-Ppv
For m energy storage subelement, the power that each energy storage subelement is distributed is identical, and is expressed as
In an embodiment of the present invention, the electric current that second DC converter energy storage subelement corresponding to exports,
Power output corresponding to being obtained after power calculation and LPF, and by the power output and the power P distributedbiMake
For the input of the droop control of the voltage-power.
In an embodiment of the present invention, the first DC converter in the photovoltaic generation unit is according to the photovoltaic cell
Ambient lighting temperature, determines voltage corresponding to the photovoltaic cell peak power output curve, and first DC converter leads to
Cross opening for control one high frequency power switch and change input equivalent resistance with shut-off, and then adjust input voltage value, make it equal to
Voltage at maximum output power point.
In an embodiment of the present invention, the platform loads include：It is directly accessed the DC load of the dc bus, leads to
The DC load for crossing the DC converter access dc bus and the exchange that the dc bus is accessed by inverter are born
One or more of carry.
In an embodiment of the present invention, the rectifier is unidirectional power stream hf rectifier；First DC converting
Device is unidirectional power stream DC converter；Second DC converter is bidirectional power flow high frequency dc to dc converter.
Compared to prior art, the invention has the advantages that：
(1) support diesel-driven generator, bulk power grid to busbar voltage, application are not included in system architecture provided by the invention
In the offshore platform electric power system away from land, construction cost and O＆M cost are substantially reduced.
(2) busbar voltage uses direct current, and it is unstable to eliminate the generation of reactive power and frequency in ac power supply system
Problem；Energy-storage units use multigroup energy storage subelement, improve the flexibility of the reliability and power distribution of system, realize system
Efficient utilization to new energy.
(3) system provided by the invention mixes control using principal and subordinate with equity, weakens supply and demand bilateral stochastic behaviour to straight
The influence of busbar voltage stability is flowed, realizes the operation steady in a long-term of system.
(4) present invention be applied to offshore platform independent operating electric power system, structure have it is simple in construction, be easy to optimization adjust
The advantages that degree, DC bus-bar voltage are stable, adaptability is stronger, overall characteristic is more superior.
Brief description of the drawings
Fig. 1 is NETWORK STRUCTURE PRESERVING POWER SYSTEM figure in one embodiment of the invention.
Fig. 2 is control method schematic diagram in one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
The present invention provides a kind of wind-light storage direct current power system for offshore platform, as shown in figure 1, including：Platform electricity
Source and the platform loads matched through dc bus with platform power；Platform power includes：Wind power generation unit, photovoltaic generation list
Member and energy-storage units；Wind power generation unit includes：Impeller, gear-box, magneto alternator and input and permanent magnetism are same
Step generator is connected and the rectifier of output end access dc bus；Photovoltaic generation unit includes：Photovoltaic cell and input
Be connected with photovoltaic cell and output end access dc bus the first DC converter；It is identical that energy-storage units include some groups of structures
Energy storage subelement, every group of energy storage subelement include that a lithium battery and input are connected with lithium battery and output end accesses directly
Flow the second DC converter of bus.
Further, in the present embodiment, energy-storage units include 3 groups of energy storage subelements.
Further, platform loads include：It is directly accessed the DC load of dc bus, is accessed directly by DC converter
Flow the DC load of bus and one or more of AC load of dc bus is accessed by inverter.
Further, rectifier is unidirectional power stream hf rectifier；First DC converter is unidirectional power stream direct current
Converter；Second DC converter is bidirectional power flow high frequency dc to dc converter.
Further, a kind of control method of the wind-light storage direct current power system for offshore platform is also provided, by energy storage
Unit as main power source, the second DC converter in energy storage subelement using the sagging equity control of power, to stable electricity
Net voltage；And wind power generation unit and real-time photovoltaic generation unit are become as slave voltage, power flow high frequency therein
Parallel operation uses maximal power tracing mode, realizes maximum power output, by the way of mixing master ＆ slave control and equity control
Coordination control is carried out, the independent complementary power supply system formed as a variety of new energy of offshore platform, scene can be achieved at random with bearing
The stable operation of system when carrying random.
In the present embodiment, also comprise the following steps：
Step S1：Impeller, gear-box, magneto alternator and rectifier are connected；Impeller converts wind energy into machine
Machine torque is converted into electromagnetic torque by tool torque, magneto alternator, and rectifier sends out permanent-magnet synchronous the control of output current
System is converted to the control of rotating speed, and to the maximum capture of wind energy or with constant power output, wind power generation unit is accessed in the form of current source
Dc bus；
Step S2：Photovoltaic cell is connected with the first DC converter；Photovoltaic cell is by solar power generation, and with direct current
Electric form output；First DC converter adjusts input voltage according to the peak power curve of photovoltaic cell, and provides photovoltaic most
High-power or constant power output, photovoltaic generation unit access dc bus in the form of current source；
Step S3：Energy storage subelement, and structure identical energy storage are formed after lithium battery is connected with the second DC converter
Output end of the subelement respectively through corresponding second DC converter is in parallel, and energy-storage units access direct current mother in the form of voltage source
Line；
Step S4：Platform loads are accessed into dc bus；Wind power generation unit, the photovoltaic generation obtained in step S1-S3
Unit, energy-storage units output end are connected in parallel, and are born as dc bus, and directly or by DC converter access direct current
Carry, loaded by inverter incoming transport；
Step S5：Based on the power system of step S4 acquisitions, the energy storage subelement relation in energy-storage units is reciprocity, and second
DC converter is formed by using the droop control of voltage-power based on current inner loop, voltage middle ring and power outer shroud
The equity control of energy storage subelement, with the voltage of stable DC bus, the direction of control power flow and numerical value；
Step S6：Using energy-storage units as main power source, with regulated output voltage, by wind power generation unit and photovoltaic generation list
Member is accessed in dc bus in the form of current source respectively as slave voltage, forms master ＆ slave control.That is, pass through step S1-S2
The wind power generation unit and photovoltaic generation unit of acquisition, and the energy-storage units that S5 is obtained, constitute the master ＆ slave control of system, that is, store up
Energy unit is used as from power supply with photovoltaic generation unit, connect in the form of power supply source as main power source, regulated output voltage, wind-power electricity generation
Enter in dc bus.
Further, in the present embodiment, in step s 5, based on current inner loop, voltage middle ring and power outer shroud
The droop control of voltage-power, is specifically included：Second DC converter power output is compared with energy storage subelement gives power
Compared with its error is after power controller, as the reference voltage of Voltage loop, compared with the second DC converter output capacitance voltage
Compared with its error is after a voltage controller, as the reference current of electric current loop, with the second DC converter outputting inductance electric current phase
Compare, its error is driven after a current controller and pulse width modulation as the high frequency of the second DC converter power device
Dynamic signal, realize the droop control of voltage-power.
Further, as shown in Fig. 2 being that the corresponding control strategy of power system is master ＆ slave control and equity in the present embodiment
Mix coordinated control mode.
Energy-storage units are made up of energy storage subelement I, energy storage subelement II, energy storage subelement III, and 3 groups of sub-unit structures are complete
Exactly the same, every group of subelement is made up of lithium battery group and the DC converter with bidirectional power flow, passes through current inner loop, voltage
Middle ring and 3 ring control strategies of power outer shroud, form the droop control of voltage-power, and then realize 3 groups of subelements of power
Equity control, the stabilization of output voltage, play primary, voltage source in power system.
In wind power generation unit, impeller realizes conversion of the wind energy to machine torque, and magneto alternator realizes that machinery turns
Square is converted to electromagnetic torque, and rectifier is realized the control of its rotating speed by the control to output generator current, realizes wind energy
Maximum capture or constant power output.
In photovoltaic generation unit, photovoltaic cell realizes solar power generation, and is exported with direct current form, the first DC converting
Device determines photovoltaic cell peak power output curve corresponding voltage, the first direct current becomes according to photovoltaic cell environment temperature and illumination
Parallel operation is made by controlling opening for high frequency power switch to change input equivalent resistance, and then adjustment input voltage value with shut-off
It is equal to voltage at maximum output power point.
Wind power generation unit and photovoltaic generation unit export in the form of current source, do not consider d-c bus voltage value and its
Stability, therefore for direct current power system of the present invention, the two category slave voltage.
Further, the rectifier in wind power generation unit is generated electricity by the rotational speed omega and permanent-magnet synchronous for obtaining gear-box
The electric current i of machine output, by using maximal wind-energy capture control method, output current iwd；
The first DC converter in photovoltaic generation unit obtains the electric current I of photovoltaic cell outputPV, voltage VPVAnd light
Battery ambient illumination temperature is lied prostrate, by using maximum power tracking and controlling method, output current iPV；Through power calculation and low pass
After filtering, the power output P of photovoltaic generation unit is obtainedpv；
Also include the power manager of a power distribution that energy storage subelement is provided, by wind power generation unit and photovoltaic
The output end and platform loads input power calculation of generator unit, and after LPF, it is defeated to obtain wind power generation unit
Go out power Pwd, photovoltaic generation unit power output PpvAnd power P needed for loadL.That is, pass through output current iwd, through work(
After rate calculating and LPF, the power output P of wind power generation unit is obtainedwd；Pass through output current iPV, through power calculation
And after LPF, obtain the power output P of photovoltaic generation unitpv；Pass through the input current i of platform loadsL, through power meter
After calculation and LPF, the input power P of platform loads is obtainedL；
The power P then provided needed for energy-storage unitsbFor：
Pb=PL-Pwd-Ppv
For m energy storage subelement, the power that each energy storage subelement is distributed is identical, and is expressed as
In the present embodiment, m=1,2 or 3.
Further, the electric current that the second DC converter energy storage subelement corresponding to exports, through power calculation and
Power output corresponding to being obtained after LPF, and by the power output and the power P distributedbiAs voltage-power
The input of droop control.
Further, platform loads include：It is directly accessed the DC load of dc bus, is accessed directly by DC converter
Flow the DC load of bus and one or more of AC load of dc bus is accessed by inverter.
Further, rectifier is with whole from blower fan to the high frequency of direct current network unidirectional power stream in wind power generation unit
Flow device；The first DC converter is with from photovoltaic cell to the change of the direct current of direct current network unidirectional power stream in photovoltaic generation unit
Parallel operation；The second DC converter is with from lithium battery to the conversion of the high-frequency direct-current of dc bus bidirectional power flow in energy-storage units
Device.
Further, offshore platform wind-light storage direct current power system, exist with land or island wind light generation technology and focus on
Distinguish.Power system provided by the invention is direct current power system, wherein not including Large Copacity land power network or big inertia bavin
Support of the fry dried food ingredients motor to DC bus-bar voltage, coordinate to control using master ＆ slave control and reciprocity mixed-control mode, with energy storage list
Member is used as main power source, stable line voltage；Using wind-power electricity generation and photovoltaic generation unit as slave voltage, the maximum of power is realized
Utilize；Energy storage subelement improves the flexibility of the reliability and power distribution of system, realizes system to the efficient of new energy
Utilize.Therefore control system provided by the present invention is good in ship marine field application prospect, and can be expected to be generalized to wave energy,
The multiple-energy-source independence complementary power supply system that other offshore novel energies such as marine tidal-current energy are formed, its huge application prospect will be to China seas
Ocean can generate electricity, ocean engineering, marine surveys play important impetus.
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, caused function are made
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (10)
- A kind of 1. wind-light storage direct current power system for offshore platform, it is characterised in that including：Platform power and through direct current The platform loads that bus matches with the platform power；The platform power includes：Wind power generation unit, photovoltaic generation unit with And energy-storage units；The wind power generation unit includes：Impeller, gear-box, magneto alternator and input with it is described forever Magnetic-synchro generator is connected and output end accesses the rectifier of the dc bus；The photovoltaic generation unit includes：Photovoltaic electric Pond and input are connected with the photovoltaic cell and output end accesses the first DC converter of the dc bus；The storage Can unit include some groups of structure identical energy storage subelements, every group of energy storage subelement include a lithium battery and input and Lithium battery is connected and output end accesses the second DC converter of the dc bus.
- 2. a kind of wind-light storage direct current power system for offshore platform according to claim 1, it is characterised in that described Platform loads include：It is directly accessed the DC load of the dc bus, the dc bus is accessed by DC converter DC load and one or more of AC load of the dc bus is accessed by inverter.
- 3. a kind of wind-light storage direct current power system for offshore platform according to claim 1, it is characterised in that described Rectifier is unidirectional power stream hf rectifier；First DC converter is unidirectional power stream DC converter；Described Two DC converters are bidirectional power flow high frequency dc to dc converter.
- 4. a kind of a kind of control method of wind-light storage direct current power system for offshore platform based on described in claim 1, Characterized in that, using the energy-storage units as main power source, the second DC converter in energy storage subelement is sagging using power Equity control, and using the wind power generation unit and real-time photovoltaic generation unit as slave voltage, led using mixing Coordination control is carried out from the mode of control and equity control.
- 5. a kind of control method of wind-light storage direct current power system for offshore platform according to claim 4, it is special Sign is, comprises the following steps：Step S1：The impeller, the gear-box, the magneto alternator and the rectifier are connected；The leaf Wheel converts wind energy into machine torque, and machine torque is converted into electromagnetic torque, the rectifier by the magneto alternator The control of permanent-magnet synchronous hair output current is converted into the control of rotating speed, it is maximum to wind energy to capture or with constant power output, And the dc bus is accessed in the form of current source；Step S2：The photovoltaic cell is connected with first DC converter；The photovoltaic cell by solar power generation, And exported with direct current form；First DC converter adjusts input electricity according to the peak power curve of the photovoltaic cell Pressure, and photovoltaic peak power or constant power output are provided, and the dc bus is accessed in the form of current source；Step S3：Energy storage subelement, and energy storage subelement are formed after the lithium battery is connected with second DC converter The output end through the second DC converter is in parallel respectively, and the dc bus is accessed in the form of voltage source；Step S4：The platform loads are accessed into the dc bus；Step S5：Energy storage subelement relation equity in the energy-storage units, and second DC converter is by using base In the droop control of voltage-power of current inner loop, voltage middle ring and power outer shroud, the equity control of energy storage subelement is formed System, to stablize the voltage of the dc bus, the direction for controlling power flow and numerical value；Step S6：Using the energy-storage units as main power source, with regulated output voltage, by the wind power generation unit and the light Generator unit is lied prostrate respectively as slave voltage, is accessed in the form of current source in dc bus, forms master ＆ slave control.
- 6. a kind of control method of wind-light storage direct current power system for offshore platform according to claim 5, it is special Sign is that the rectifier in the wind power generation unit is same by the rotational speed omega and the permanent magnetism for obtaining the gear-box The electric current i of generator output is walked, by using maximal wind-energy capture control method, output current iwd；First DC converter in the photovoltaic generation unit obtains the electric current I of the photovoltaic cell outputPV, voltage VPV And photovoltaic cell ambient lighting temperature, by using maximum power tracking and controlling method, output current iPV；Through power calculation with And after LPF, obtain the power output P of photovoltaic generation unitpv；Also include a power manager, pass through output current iwd, after power calculation and LPF, obtain wind-power electricity generation list The power output P of memberwd；Pass through output current iPV, after power calculation and LPF, obtain the defeated of photovoltaic generation unit Go out power Ppv；Pass through the input current i of the platform loadsL, after power calculation and LPF, obtain platform loads Input power PL；The power P then provided needed for the energy-storage unitsbFor：Pb=PL-Pwd-PpvFor m energy storage subelement, the power that each energy storage subelement is distributed is identical, and is expressed as：<mrow> <msub> <mi>P</mi> <mrow> <mi>b</mi> <mi>i</mi> </mrow> </msub> <mo>=</mo> <mfrac> <msub> <mi>P</mi> <mi>b</mi> </msub> <mi>m</mi> </mfrac> <mo>=</mo> <mfrac> <mrow> <msub> <mi>P</mi> <mi>L</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>w</mi> <mi>d</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> <mi>m</mi> </mfrac> <mo>.</mo> </mrow>
- 7. a kind of control method of wind-light storage direct current power system for offshore platform according to claim 6, it is special Sign is, the electric current that second DC converter energy storage subelement corresponding to exports, through power calculation and low pass filtered Power output corresponding to being obtained after ripple, and by the power output and the power P distributedbiAs under the voltage-power The input of vertical control.
- 8. a kind of control method of wind-light storage direct current power system for offshore platform according to claim 6, it is special Sign is that the first DC converter in the photovoltaic generation unit determines institute according to the photovoltaic cell ambient lighting temperature Voltage corresponding to photovoltaic cell peak power output curve is stated, first DC converter is by controlling a high frequency power to switch Open with shut-off change input equivalent resistance, and then adjust input voltage value, make it equal to voltage at maximum output power point.
- 9. a kind of control method of wind-light storage direct current power system for offshore platform according to claim 5, it is special Sign is that the platform loads include：Be directly accessed the DC load of the dc bus, accessed by DC converter described in The DC load of dc bus and one or more of AC load of the dc bus is accessed by inverter.
- 10. a kind of control method of wind-light storage direct current power system for offshore platform according to claim 5, it is special Sign is that the rectifier is unidirectional power stream hf rectifier；First DC converter becomes for unidirectional power stream direct current Parallel operation；Second DC converter is bidirectional power flow high frequency dc to dc converter.
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